I had a Control 4 Pro dealer come out and review my situation. He confirmed that the Sony receivers are my problem to getting upgraded to the current OS. He recommended a Control 4 C4-EA5-V2 ($2,140.55). My question to the board is what controller should I go with to take that functionality out of the Sony receivers? Can I go with EA1 or do I need EA5? What is the difference between the two?